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Updated: Aug 27, 2025
11:20
Fabrication and Visualization of Capillary Bridges in Slit Pore Geometry
Published on: January 9, 2014
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Geometric characterization of polymeric capillaries
Enas N Yousef1, Purnendu K Dasgupta1, Seth A Horn1
1Department of Chemistry and Biochemistry, University of Texas at Arlington, Arlington, TX, 76019-0065, United States.
Analytica Chimica Acta
|September 26, 2022
Summary
Measuring the inner diameter of small synthetic polymer capillaries is challenging. New methods provide consistent results and reveal bore variance has minimal impact on open tubular liquid chromatography performance.
Area of Science:
- Analytical Chemistry
- Materials Science
Background:
- Accurate measurement of inner diameter (i.d.) is crucial for small synthetic polymer capillaries, yet methods are limited.
- Beyond i.d., capillary circularity, concentricity, and bore uniformity are important application parameters.
Purpose of the Study:
- To present multiple methods for measuring the inner diameter of small synthetic polymer capillaries.
- To introduce a novel quantitative index for capillary concentricity.
- To investigate the impact of i.d. uniformity on measurement outcomes and chromatographic performance.
Main Methods:
- Fluid flow resistance measurements.
- Capillary internal volume and length analysis.
- Microscopy-based diameter determination.
Main Results:
- Multiple measurement techniques yielded mutually consistent results for capillary inner diameter.
- A new index for concentricity was defined and applied.
- Non-uniform inner diameters could be characterized by mean and variance.
- Bore variance showed negligible effect on open tubular liquid chromatography efficiency.
Conclusions:
- Developed and validated methods for characterizing small synthetic polymer capillary dimensions.
- Demonstrated the ability to quantify non-uniformity in capillary i.d.
- Found mean i.d. is key for chromatography, while bore variance has minimal impact.
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